TY - JOUR
T1 - Atomic H* enhanced electrochemical recovery towards high-value-added metallic Sb from complex mine flotation wastewater
AU - Yang, Liming
AU - Yi, Genping
AU - Wang, Bo
AU - Shao, Penghui
AU - Feng, Yufa
AU - Liu, Yanbiao
AU - Yu, Kai
AU - Liu, Fuqiang
AU - Liu, Lingling
AU - Luo, Xubiao
AU - Luo, Shenglian
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022
Y1 - 2022
N2 - Simultaneous recovery and value-added conversion of hazardous heavy metal ions from complex wastewater sources is of great significance yet challenging. Herein, we demonstrate that highly toxic antimonite Sb(III) could be effectively recovered from antimony (Sb) mine flotation wastewater and converted into high-value-added metallic Sb using a novel facile atomic H* enhanced electrochemical reduction avenue coupled with thermal reduction by H2 gas. The high production of atomic H* generated from the electrochemical cathode with an optimum reduction potential of –1.2 V vs.
Ag/AgCl, which is lower than the Sb(III) reduction potential of –1.0 V,
might be attributable to the superior Sb recovery capabilities.
Furthermore, the metallic Sb concentration
at –1.2 V was 14.43 times greater than at –1.0 V due to the strong
reductivity of atomic H*. In addition, Sb(III) removal efficiency was
found to be as high as 98.52%, with a metallic Sb recovery rate of up to
1.67 mg min–1. The efficiency of Sb(III) recovery was
demonstrated throughout a wide pH range, with metallic Sb being the
main product, independent of the presence of multiple coexisting ions.
Economic analysis also indicated that treating Sb mine flotation
wastewater per ton may yield a net profit of $40.09. This research
contributes to the advancement of an atomic H* enhanced electrochemical
technology for high-valued heavy metal recovery from complex heavy
metal-polluted wastewater.
AB - Simultaneous recovery and value-added conversion of hazardous heavy metal ions from complex wastewater sources is of great significance yet challenging. Herein, we demonstrate that highly toxic antimonite Sb(III) could be effectively recovered from antimony (Sb) mine flotation wastewater and converted into high-value-added metallic Sb using a novel facile atomic H* enhanced electrochemical reduction avenue coupled with thermal reduction by H2 gas. The high production of atomic H* generated from the electrochemical cathode with an optimum reduction potential of –1.2 V vs.
Ag/AgCl, which is lower than the Sb(III) reduction potential of –1.0 V,
might be attributable to the superior Sb recovery capabilities.
Furthermore, the metallic Sb concentration
at –1.2 V was 14.43 times greater than at –1.0 V due to the strong
reductivity of atomic H*. In addition, Sb(III) removal efficiency was
found to be as high as 98.52%, with a metallic Sb recovery rate of up to
1.67 mg min–1. The efficiency of Sb(III) recovery was
demonstrated throughout a wide pH range, with metallic Sb being the
main product, independent of the presence of multiple coexisting ions.
Economic analysis also indicated that treating Sb mine flotation
wastewater per ton may yield a net profit of $40.09. This research
contributes to the advancement of an atomic H* enhanced electrochemical
technology for high-valued heavy metal recovery from complex heavy
metal-polluted wastewater.
KW - Antimony
KW - Atomic H
KW - Flotation wastewater
KW - High-value-added metallic Sb recovery
U2 - 10.1016/j.resconrec.2021.106020
DO - 10.1016/j.resconrec.2021.106020
M3 - Journal article
AN - SCOPUS:85118553464
SN - 0921-3449
VL - 178
JO - Resources, Conservation and Recycling
JF - Resources, Conservation and Recycling
M1 - 106020
ER -